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Network Security, Compliance and Governance →easyMultiple SelectObjective-mapped

ANS-C01 Network Security, Compliance and Governance Practice Question

This ANS-C01 practice question tests your understanding of network security, compliance and governance. Match the stated requirement to the specific cloud service, access model, or configuration option — many options are valid in isolation but not for this scenario. After answering, compare your reasoning against the explanation and wrong-answer breakdown below. Once you have made your selection, read the full explanation to reinforce the concept and understand why each distractor is designed to mislead on exam day.

A security team needs to block outbound traffic from an EC2 instance to known malicious IP addresses while allowing all other outbound traffic. Which THREE steps should be taken? (Choose three.)

Question 1easymulti select

Full question →

A
Configure network ACLs to deny outbound traffic to the malicious IPs.
Why wrong: Wrong: NACLs are stateless and not suitable for application-layer filtering.
B
Update the VPC route table to send traffic for the malicious IPs to a network firewall appliance.
Correct: Route traffic to firewall for inspection.
C
Deploy AWS Network Firewall in the VPC to perform stateful inspection.
Correct: AWS Network Firewall can block specific IPs.
D
Create a firewall rule in AWS Network Firewall that denies traffic to the malicious IPs.
Correct: The firewall rule denies traffic to listed IPs.
E
Modify the security group for the EC2 instance to deny outbound traffic to the malicious IPs.
Why wrong: Wrong: Security groups cannot block individual IPs in outbound rules; they allow/deny based on CIDR.

Full breakdown with real-world context →

Answer choices

Why each option matters

Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.

Correct answer & explanation

✓

Update the VPC route table to send traffic for the malicious IPs to a network firewall appliance.

Option A is correct because the VPC route table directs traffic; the malicious IPs must be routed to a network firewall appliance. Option B is correct because a network firewall (like AWS Network Firewall) can inspect and block traffic to specific IPs. Option D is correct because the firewall rule should explicitly deny traffic to the malicious IPs. Option C is wrong because Security Groups are stateful and can only allow/deny inbound/outbound based on source/destination, not specific IPs in a scalable way; they are not designed for blocklists. Option E is wrong because NACLs are stateless and do not support stateful inspection or application-layer filtering.

Key principle: NAT direction and interface roles matter as much as the IP address mapping. Inside/outside designation controls which traffic is translated.

Answer analysis

Option-by-option breakdown

For each option: why learners choose it and why it is or isn't the right answer here.

✗
Configure network ACLs to deny outbound traffic to the malicious IPs.
Why it's wrong here
Wrong: NACLs are stateless and not suitable for application-layer filtering.
✓
Update the VPC route table to send traffic for the malicious IPs to a network firewall appliance.
Why this is correct
Correct: Route traffic to firewall for inspection.
Related concept
Static NAT maps one inside address to one outside address.
✓
Deploy AWS Network Firewall in the VPC to perform stateful inspection.
Why this is correct
Correct: AWS Network Firewall can block specific IPs.
Related concept
Static NAT maps one inside address to one outside address.
✓
Create a firewall rule in AWS Network Firewall that denies traffic to the malicious IPs.
Why this is correct
Correct: The firewall rule denies traffic to listed IPs.
Related concept
Static NAT maps one inside address to one outside address.
✗
Modify the security group for the EC2 instance to deny outbound traffic to the malicious IPs.
Why it's wrong here
Wrong: Security groups cannot block individual IPs in outbound rules; they allow/deny based on CIDR.

Common exam traps

Common exam trap: NAT rules depend on direction and matching traffic

NAT is not only about the public address. The inside/outside interface roles and the ACL or rule that matches traffic are just as important.

Detailed technical explanation

How to think about this question

NAT questions usually test address translation, overload/PAT behaviour, static mappings and whether the right traffic is being translated. Read the interface direction and address terms carefully.

KKey Concepts to Remember

Static NAT maps one inside address to one outside address.
PAT allows many inside hosts to share one public address using ports.
Inside local and inside global describe the private and translated addresses.
NAT ACLs identify traffic for translation, not always security filtering.

TExam Day Tips

Identify inside and outside interfaces first.
Check whether the scenario needs static NAT, dynamic NAT or PAT.
Do not confuse NAT matching ACLs with normal packet-filtering intent.

Key takeaway

NAT direction and interface roles matter as much as the IP address mapping. Inside/outside designation controls which traffic is translated.

Real-world example

How this comes up in practice

A healthcare organisation deploys an application with a public-facing web tier and a private database tier. The database subnet has no public IP and only accepts connections from the web tier's security group. Questions like this test whether you can design cloud network isolation using VNets/VPCs, subnets, and security group rules.

What to study next

Got this wrong? Here's your next step.

Review the four NAT address types (inside local, inside global, outside local, outside global), PAT port overload, and static vs dynamic NAT use cases. Then practise related ANS-C01 NAT questions on configuration and troubleshooting.

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FAQ

Questions learners often ask

What does this ANS-C01 question test?

Network Security, Compliance and Governance — This question tests Network Security, Compliance and Governance — Static NAT maps one inside address to one outside address..

What is the correct answer to this question?

The correct answer is: Update the VPC route table to send traffic for the malicious IPs to a network firewall appliance. — Option A is correct because the VPC route table directs traffic; the malicious IPs must be routed to a network firewall appliance. Option B is correct because a network firewall (like AWS Network Firewall) can inspect and block traffic to specific IPs. Option D is correct because the firewall rule should explicitly deny traffic to the malicious IPs. Option C is wrong because Security Groups are stateful and can only allow/deny inbound/outbound based on source/destination, not specific IPs in a scalable way; they are not designed for blocklists. Option E is wrong because NACLs are stateless and do not support stateful inspection or application-layer filtering.

What should I do if I get this ANS-C01 question wrong?

What is the key concept behind this question?

Static NAT maps one inside address to one outside address.

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